/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.xXjD9KSIUzx/rev.1380
 * 
 * authors: 
 *   alexsmith540

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



// Pressing Control-R will render this sketch.

int i = 0; 
float originx, originy, q1x, q1y, q2x,q2y, q3x,q3y, q4x,q4y, q4x1,q4x1;
float q1dir,q2dir,q3dir,q4dir,origindir, colordir = 1;
float r,g,b = 0;
void setup() {  // this is run once.   
    
    // set the background color
    background(255);
    
    // canvas size (Variable aren't evaluated. Integers only, please.)
    size(500, 500, P3D); 
    originx = random(width/2-100,width/2+100);
    originy = random(height/2-100,height/2+100);
    q1x = random(0,width/2);
    q1y = random(0,height/2);
    q2x = random(width/2,width);
    q2y = random(0,height/2);
    q3x = random(0,width/2);
    q3y = random(height/2,height);
    q4x = random(width/2,width);
    q4y = random(height/2,height);
    q4x1 = random(q4x,originx);
    q4y1 = random(q4y,originy);
    // smooth edges
    smooth();
    
    // limit the number of frames per second
    frameRate(30);
    
    // set the width of the line. 
   stroke(color(r,g,b));
} 

void draw() {  // this is run repeatedly.  

    noFill();
    strokeWeight(0.1);
    //stroke(0);
beginShape();
curveVertex(originx,originy);
curveVertex(originx,originy);
curveVertex(q1x,q1y);
curveVertex(q2x,q2y);
curveVertex(q3x,q3y);
curveVertex(q4x,q4y);
curveVertex(q4x1,q4y1);
curveVertex(originx,originy);
curveVertex(originx,originy);
endShape();
reCalc();
}
void reCalc(){
    q1dir = q1x < width && q1y < height ? (q1x > 0 && q1y > 0 ? q1dir : 1) : (q1dir == 1 ? 0 : 1);
    q2dir = q2x < width && q2y < height ? (q2x > 0 && q2y > 0 ? q2dir : 1) : (q2dir == 1 ? 0 : 1);
    q3dir = q3x < width && q3y < height ? (q3x > 0 && q3y > 0 ? q3dir : 1) : (q3dir == 1 ? 0 : 1);
    q4dir = q4x < width && q4y < height ? (q4x > 0 && q4y > 0 ? q4dir : 1) : (q4dir == 1 ? 0 : 1);
    origindir = originx < width && originy < height ? (originx > 0 && originy > 0 ? origindir : 1) : (origindir == 1 ? 0 : 1);
    //random makes it a little rougher...
    q1x += q1dir == 1 ? random(0,1): random(0,-1);
    q1y += q1dir == 1 ? random(0,1): random(0,-1);
    q2x += q2dir == 1 ? random(0,1): random(0,-1);
    q2y += q2dir == 1 ? random(0,1): random(0,-1);
    q3x += q3dir == 1 ? random(0,1): random(0,-1);
    q3y += q3dir == 1 ? random(0,1): random(0,-1);
    q4x += q4dir == 1 ? random(0,1): random(0,-1);
    q4y += q4dir == 1 ? random(0,1): random(0,-1);
    originx += origindir == 1 ? random(0,1): random(0,-1);
    originy += origindir == 1 ? random(0,1): random(0,-1);
    //change colors? 
    float m = millis();
    
    if(m % m == 0){
        
        colordir = r == 0 ? (colordir == 0 ? 1 :colordir) : (r >= 255 ? 0 : colordir);
        r += colordir == 1 ? 1 : -1;
        //g += colordir == 1 ? 1 : -1;
        //b += colordir == 1 ? 1 : -1;
        stroke(color(r,g,b));
        }
        }